Because Hippos don't have wings.
Hippos cannot fly, they are mammals and mammals can't fly, however their is an exception of the bat being a flying mammal.
penguins cant fly, and chickens cant propperly fly!
africa in the state of it the scientists do not really know until they fly there
fruits cant fly...........
no he cant fly he is to heavy
you cant fly it is not posibble
you cant fly it is not posibble
till it cant fly
Penguins cant fly.
batman cant fly he glides using his cape so no he cant
He cant fly because his balance would be bad, they cant fly
you cant...... -_-